Machine for grinding spectacle and other glasses..



A. BGKSTEIN. MACHINE FOB GRINDING EPEOTAULE AND OTHER GLASSES. APPLIOATIO! mum D20. 24, mo.

1,051,869.' Patented Feb. 1913.

5 BEEETHHEB'I' 1.

Wilt-1:55:52 .lnvenlnn: ARNOLD Emu-cm cowm MIA"! 'AIIlIM. D- in A. EOKSTBIN. MACHINE FOB GRINDING BPEOTAOLB AND OTHER GLASSES.

. APPIIIOATIOH FILED DEO.M,1910. 1,051,869. Patented Feb. 1913.

5 IEEETHBIIZT 2.

Ammo Ecxsrsm A. BUKSTEIN. nomm: r02 enmnme summon: AND 0mm cusses. APPLICATION TILED 1120.24, 1H0.

1,05 1,869, Patented Feb. 4, 1913.

b IBBBTHHEET 3.

WITNESSES:

' INVENTOR dvmuolcq -rrnv 1 e ATTORNEY A. EGKSTEIN.

IAOHIHE FOB GRINDING SPEOTAOLE AND OTHER GLASSES.

Patented Feb. 4, 1913.

LPPLIOATIOI FILED DBO. N, "10.

.Invenhar:

flauow cxntm Attorney A. EGKSTBIN.

MACHINE FDR GRINDING SPECTAGLE AND OTHER GLASSES.

'5 sums-sum 5.

.1 11v Emir:

Patented 7 Feb. 4,1913.

APPLICATION FILED DEG. 24, 1910.

ITED, STATES PATENT OFFICE.

'i gfinonnnoxsrnm, or PRAGUE, AUSTRIA-HUNGARY, assreivon or ONE-HALF TO -SEYBOTH & COMPANY, or ZWICKAU, GERMANY.

mncnmn FOR GRINDING SPECTACLE AND OTHER GLASSES.

Specification of Letters Patent.

Patented Feb. 4, 1913.

Application filed December 24, 1910. Serial No. 599,112.

To all whom it may concern:

Be it known that I, ARNOLD Eonsrn'm, asubject of the Austro-Hungarian Emperor,

and resident of Prague, Bohemia, Austriafmands little attention.

The improved machine. is equipped with rotating superposed grind-stones and with work holding devices slidable on horizontal tables arranged coaxially with the grind- *stones, each work holder being adapted to receive a pile of glasses and being so constructed that the glassesmay be readily r'e- 'moved and replaced by others at the proper time. a g

In the preferredform of the machine "two superposed grind stones with two tahbles,-each, having eight work holders, are

provided.

The machine is also rovided with means for centering the piles glasses to be ground and with an. indicating device which obwviatesgthe necessity for continuous super vision' of the progress of the grinding operation so that one operator may attend to two, or more machines.

' Other .features and advantages will appear from the following description.

In the accompanying drawings which illustrate theinvention, Figure 1. shows an elevation of a'fmachine with two grind-stone's and .two tables, one' work holder being shown on each table. Fig. 2 is a part plan of the machine; Fig. 3 is an elevation of a workholder to an enlargetl' scale, Fig. i is a plan and Fig. is a side elevation of Fig. 4. It may be remarked that, in Figs. 1, 3, 4 and 5, the work-holder is not shown in its operative position v1z:appr'on 1- mately tangential to the grind-stone but in these figures is shown for the sake of clearne'ss out of its normal working posltion.

' The actual operative position is indicated in Fig. 2. Fig. 6 shows a modified construction of work holder, a device for automatically opening and closing the clamping jaws being provided in thiscase. Figs..7, 8, and 9 show the centering means'in elevation and in section. Figs. and 11 show diagrammatically in plan and elevation a work holder constructed on the turret principle.

Referring to the drawings, the vertical spindle 2 which is driven by a belt 1 arranged beneath the floor, carries the grindstones 3 and 4 which are secured upon the spindle by means of nuts 5 and washers 6; the spindle is supported in bearings 7 8 on the tables 10 and 11 and also by a bearing 9 arranged on a cross bar 9*, and by a footstep bearmg 12. The tables 10 and 11 are braced by means of columns 13. Radial .gulde ways 14: corresponding in number to the number of work holders are provided upon the tables 10, 11. (Inwthe present instance there are eight work holders for each table). Fitted to move in these guide ways are slides 15 carrying the-work holders 17. Each work holder '17 comprises a rigid standard 16 and a frame formed by a sleeve 18 mounted on pivot pins in said standard co-axially with pinions 19 and 49, horizontal arms 26, 27 on said sleeve and clamping jaws 28, 29,1301 the glasses 30 'at the ends of said arms (Fig. 3). It will be un derstood that on angular movement of the said frame (26,27, 18) the glassesvwill be brought into contact with the grind-stone, and on the actuation of a clutch 46 rotation is imparted to the spindle 20 and the clamping jaws, from the spindle 2 by meansof an endless belt or cord drive as shown in Figs. 1 and 2.

Fig. 3 shows a "portion ofthe horizontal. grinding table 10 together with the slide 15 operated by means of a rack 21, a pinion 22, bevel gear 23, and a hand wheel 24, the work holder 17 for a pile ofglasses being mounted on said slide 15. a Y

The clamping jaws are secured to spindles 31, 32, upon which are mounted pinions 33, 34,.which are driven by gear wheels' In order to permit of the glasses 30 being clamped between the jaws which are lined with rubber, leather or cardboard disks, the upper spindle 31 is adapted to be raised by means of a screw-threaded spindle 36 provided with, a hand wheel 35, agalnst the action of a spring 37. In order to 30111. tate the interchanging and clamping of, the glasses, the frame'18, 26,,27, may

be held.

in position away from the grind-stone by a lockmg device 51, mounted 'on a bracket 50 at the slde of the standard 16 (Fig. 3).

This lockin' device comprises a cylindrical casing in w ich is "lnjcated a spring-pressed plunger, carrying at its upper end a notched cross bar 52. A lug 53 rigidly'secured to [the arm 26 is adapted to engage with the i I fected by means of an outwardly projecting notch, in said cross bar 52 thereby securing the frame in vposition, the release being ef- 61. To press the glasses properly against the grind-stone when being ground, an arm 63 is fixed at .62 on one side of the sleeve 18,

said arm carrying atone end a pin to whlch is secured a cord or wlre 64 which is led over a pulley. 65 and on which are suspended weights 66, 67. The pressure may be varied by addition or removal of weights.

The arrangement of the electrical indicating device may be clearly seen from I I F igl I I I i The stop 60 cooperating withthe templet 59 is insulated from the table by .means of a vulcanite sheet 68 and forms one'endof'an electrical circuit through one of the lamps' of an indicator 69, while the. other end. of

' the slide of the work-holder. The lamps arefore controlled by-the stop 60; the opera-- the circuit is formed by the terminal 70.011

disposed side by side and are separated partitions. A small ground glass disk is placed in :front of each lamp and on each is. niarked the indicating numberof a 'corre' sponding work-holder. The circuit is theretion being as follows: The clamped glasses 30 contact during the grinding operation with the stone so long as their diameter is greater than, the 'templet and while the templet itself is at a distance from its stop. When the glasses are sufliciently ground, the templet will contact with the stop and close the electric circuit, causing the corresponding lamp to 'light. As soon'as those portions of the edges of'the glasses which.

still require to be ground are brought into contact with the stone by the rotation of the work. holder, the templet is moved. out of contact with its stop vlng lamp is' extinguished. The temporary illumination of a lamp therefore merely indicata flat the glasses in a certain workholder am sufliciently ground at some parts,

the completion of the grinding operation being indicated by the permanent lighting of the lamp. The indicating device may be and the correspond.

minim protected from daylight by 'a dark screen so as to render theindications Of'llhfl lamps more. prominent. The, modus operandi of the grinding machine shbwn is as follows: Each of the grind-stonesB and 4, which are driven by the belt 1 coiiperates in the present case with eight wo1'k'-holde1's. Pulleys 39 are driven by means of a cord or be t drive -10 from the pulleys 38 on the spindle 2. These pulleys 39 transmit rotation by means of spin-' dles L2 to the bevel gears 43 and thence through the shafts 45, mounted in bearings 47, to the bevel wheels 48, 49. Upon the spindle- 9.5 of each wheel 49 is mounted the spur {wheel 19 which transmits motion through the pinions 57, 58, which are mount ed on an intermediate spindle 55,-to the. wheels 34:, 33 and the spindles 32 and 31 of the clamping jaws 29, 28, thus rotating the glasses 30. A pile of glasses 30, the edges of which are to be ground is clamped be tween the clamping jaws, a device referred to below, serving to facilitate the centering ofthe glasses. The clamping is performed .while the clutch 46 of the shaft 45 is in its disengaged position and the frame 26, 27, 18 is turnedaside into a position in which it can be held by the locking device 51. After the glasses are clamped and the clutch 46 is brought into engagement the frame is re' leased fromthe locking device 51 and. turned slowly toward the stone whereupon the rotating glasses are automatically ground until the permanent illumination of the'larnp corresponding to the particular work-holder indicates the completion of the grinding. Thereupon the framev 26, 27, 18, is again swung aside until it is engaged by the locking device 51, the clutch 46 is then, disengaged and theglasses are released by the action of raising the spindle 36 by means of the hand wheel 35, so that the glasses may be easily withdrawn and re.

placed by afresh set.

Fig. 6 shows a work-holder of a somewhat a different construction, a wrought iron standard 72 being used in placeof the standard '16, the upper one of the pivots 25 about which the frame 18', 26, 27 may be swung, carries a stationary toothed segment 73 engaged by a pinion 74. The latter-is held-- .in engagement with the boss 78 of the upperarm of the frame, by a screw which engages a groove 76 in the extended boss '75- of the pinion 74:; the latter is threaded and through it passes a screw-threaded sleeve 79 which receives the spindle 36, the upper end of which. is connected with the sleeve 79 by means of a screw 81 and bridge piece 80,

in the manner of a boring machine spindle.

In other respects the construction shown in Fig. 6 is similar to. that previously described. hen the frame 18, 26', 27' is swung aside for the purpose. of interchanging the glasses, the pinion 74 is rotated relatively to the stationary toothed segment 73 andcauses the screw-threaded sleeve'7 9, and thereby the spindle 36, to, rise 'to a corresponding extent. The upper clamping jaw is thus raised and the glasses 30 are released. r

The centering means Figs. 7, 8, 9, include two'pivoted gripper arms 83, 84, connected .jaws ofthe centering device and if necessary the glasses are separated from one another by moist cardboard disks; whereupon I said centering device is brought betweenthe clamping jaws and the spindle 36 is lowered by manipulatmg the handle 35, thus clamplng the glasses. Thereupon the centering device is opened by pressing the ends 99,-

100, of the gripper arms together against the action of the spring 85, and can then beremoved to one side. Each centering device is pivotally mounted upon the intermediate spindle 55 (as indicated in Figs. 3 and 8).

Figs. 10 and 11 show diagrammatically in plan and elevation a so-called turret ar- Figs. 1, 2,

rangement of work-holder, the holder being in this case rotatable on the axis A. 4 denotes the grind-stone, the glasses to be ground, 96 the frame rotatable about the axis A, 97 the standard and 98 the supporting table. WVhile the glasses 30 are being ground a fresh set of glasses may be inserted in the other clamping members of the turret frame as at 30 and, upon rotation of the frame, these may in turn be brought into contact with the grind-stone.

\Vith the grinding machines shown in 3,4; 5. so-called invisible glasses may be ground by the use of agrindstone having a wedge-shaped edge, or by the use of a suitable metal disk. 1 Having now descrlbed my lnvention' what 'I claim and desife to secure by Letters Patent of the United States 1s:--

1. In a machine for grinding the edges of glasses, the combination of a vertical driveshaft; a grindstone thereon and having a peripheral grinding face, a work table: a

plurality of standards substantially radially slidably mounted on the work-table and arranged at various positions all around the grind-stone; a frame p ivotally mounted on each standard; a rotating spindle on the outer part of said frame; means for clamping a pilev of glasses thereon coaxial with the spindle and parallel to the axisof the grind-stone; meansadapted for rotating the spindle whatever be the adjusted position of the frame and the standard, and

ing means for each standard and disposedat the outer edge of the table where it is easy of access. I

2. In a machine for grinding the edges glasses, the combination of a vertical dri -v e shaft; a grind stone thereon and having a peripheral grinding face, a work table; a

plurality of standards radially slidably mounted on the work-table and arranged therearound; a rack at the lower part of each standard; aframe pivotally mounted on' each standard; a rotating spindle on the outer part of said frame; meansfor clampmg a p le of' glasses thereon coaxial with the spindle and parallel to the axis of the grind-stone; means for rotating the spindle in any operative position thereof; a templet on said spindle; an adjustable stop adapted to be engaged by the templet; means for yieldably moving the frame to cause the glasses to engage said face or the templet.

to engage the stop; a pinion for engaging said rack; and means located. beyond the edge of the table for operating the pinion.

3. In a machine for grinding the edges of glasses, the combination of a drive-shaft; a grind-stone thereon and having a cylindrical peripheral grinding face; a work-table substantially perpendicular to the drive-shaft and provided with a slide-way approximately radial to the drive-shaft; a standard adjustable in said slide-way; a frame pivo-tally mounted on said standard and pivotally movable on an axis parallel to said shaft; apair of coaxial rotatable spindles on the outer part of said frame and parallel with said shaft; a slidable spindle in one of "said'rotatable spindles; jaws on said slidable spindle and the opposite rotatable spindle;

a spring pressing in said slidable spindle for clamping the jawstogether: means for separating the jaws; a rotatable gear coaxial with said axis: an operative connection between said shaft and rotatable gear adapted 'forrotatin the 'ear for any aosltion of the-standard iii-the slide-way; a gear-connection-between one of thesald splndles and said i-(jitatable gear: means for moving the frame to cause the pile of glasses to press against said peripheral grinding face; a templct on the lower end of the lower spindle; and a stop adapted to be engaged by the templet.

4. In a machine for grinding the edges of glasses,'tl1c coi'nbination of a vertical driveshaft; a plurality of grind-stones thereon and having a cylindrical peripheral grinding face; horizontal work-tables one for each grind-stone and provided with a plurality of slide-ways approximately radial to the driveshaft; a standard slidable in each slide-way;

a frame pivotally mounted on said standard and plvotally movable on an axis parallel tov said shaft; a pair of coaxial rotatable vertical spindles on the outer part of said frame and adapted to clamp a pile of glasses ,therebetween; a rotatable spur gear coaxial with saidaxis .said shaft; bevel gears slidable on said spinradial spindles operatedfrom Idle}- as said standard moves; ,an operative connection between said bevel gear and said spur gear; a gear connection between one of said Vertical spindles and said rotatable :spungear; ineans'for'mo the frame to cause the pile of glasses ts pressagainst said peripheral grinding face; atemplet on the lower'end of the lower spindle; a stop adapted to be engaged by the spindle; a rack on each of said standards; a radial adjusting rod under each' table; adjusting gears on each adjusting rod; and intermediate gears engaging said rack 91nd the adjusting gears. In testimony whereof I have-signed my name to this specification in the presence of two subscribing witnesses.

ARNOLD ECKSTEIN. Witnesses:

Grone Ecnsmm, ADOLPH FISCHER. 

